Shank and bit punch



' Sept. 7 1926.- r 1,599,199

v v L. c. BAYLES SHANK AND-BIT PUNCH Filed Au ust 26, 25 I Q SheetS-Sheet 1 INVENTOR Lea/1s l Sept. 7'', 1926. I 1,599,199

L. c. BA-YLES SHANK AND BIT PUNCH Filed August 26 1925 2 Sheets-Sheei 2 v INVENTOR jeu'ridtiBqyied' Patented Sept. 7, 1926.

UNITED STA LEWIS C. BAYLES, OF EASTQ CITY, NEW JERSEY, A

IPANY, OF JERSEY TES PATENT, FICE. Y1

1\T, PENNSYLVANIA, ASSIGNORLTOINGERSOLL-RAhTDCOM- CORPORATION OF NEW JERSEY.

SHANK Ann BIT ruucn.

Application filed August 2 ,1925. Serial No. 52,525.

This invention relates to shankand bit" but more particularly for opening punches,

the hollow bores of drill steels and'sim'llar hollow articles.

The machine may be mounted on the frame of a drill steel sharpener or on a pedestal as desired, and means are provided for clamping the drill steel.

' is provided 7 The objects of the invention are to improve upon that type of shank and bit punch in which the pin punch drill steel and pulled out is pushed into the of the drill steel by means of a fluid actuated reciprocating piston.

used, power is lost owing to the In a. push punch, as the term is high velocity of the piston at the start while the resistance to the entrance of the p1n punch into the drill steel is least at the entrancev drill steel, and'to overof the bore of the come this disadvantage I means for controlling the.

the velocity will be substanpiston so that have provided velocity of the tially constant throughout the piston stroke.

In this. way, obtained for the maximum power may be forcing the pinpunch the required distance into thedrill steel. I Another object of the invention is to provide means. for controlling the velocity of the piston of the punch in both directions in thismachine, I use cushioning fluid, such as oil, tanks forthe oil and for velocity. control preferto and a reservoir tank or' connected to the cylinder of the punch.

Further objects of the invention will hereinafter appear and the invention is shown in its preferred forms in the accompanying drawings, in which Figure 1 is a side elevation partly. in longitudinal section showing apparatus, and

vFigure the modification.

Referring to the drawings, a suitable base or frame A, which may be one form of the 2 is another similar view showing the base or frame of a drill sharpener or a separate pedestal,

with clamping jaws B which -may be the supplemental clamping jaws on a drill sharpener C on a drill sharpening supplemental clamping jaws are for holding the drill steel machine. These commonly provided at one side ofthe central axis of the machine for in which case the various clamping purposes shank and bit punch would be located on a bracket with its longitudinal axis in line with the sup plemental clampiward end of the connection ing jaws. This,however, is common practree and has been used ever slnce shank and bit punches have been used so thatthe ac.-

mar mounting of the shank and bit punch is jonthefr'ont head L of the cylinder and a cupleather 0 preferably surrounds the piston rod beneath the cap K. The cylinder back head]? may be secured to the cylinder in any suitable manner (not shown).

A valve casing Q, is conveniently provided on the frame A to'which is connected the motive fluid supply pipe R for pressure ffluid, the punch. A suitable valve'S controls the supply such as compressedair, for operating of motive fluid to the rearward'end of the cylinderthrough the port Tand mo- Figure 1 means are provided for cushioning the forward strokefof the. piston E and thereby controlling'thevelocity of the piston. For this purpose, I prefer to use a reservoir, tank V for cushioning fluid, such as oil, connectedat its upper end to theforcylinder D as by means of the pipe W preferably provided with the 'valve X for controlling this connection.

The reservoir tankV may be constructed in any suitable manner and may be proa point near the bottom thereof for conveying Oil from the tank to the cylinder. Perforated baffle plates (1, b and 0 may encircle the tube to retard the flow of oil from the cylinder into the tank. 'Apressure fluid d is connected between the valve chest Q and the upper portion of the reser voir tank V. A port 6 may be provided for the forward 7 forming a vent, but'if desired, the oil could pass" into and out of end of the cylinder controlled by the cook 'tive fluid is exhausted through the port U. In the form of the invention shown inv vided with the tube Y flared at its lower end as at Z andextending through thetank to ice 5 scribed, letitibe-a'ssumed that the valve S isin the position -'indicated in which case pressure fluid from the supply pipe R is admltted behind the piston E to drive it forward and carrythe pin punch into the drill steel.

The oil 9 in front of the 'piston'is forced through the valve X and pipe'W into the reservoir tan'kV anditherate of flow of oil a is cont'rolled'by the setting 'of the valve X thus Controlling the velocity ofthe piston. Full linefpr'essure is obtainedagainst the "piston to jforce it' forwardly ata given rate which will be determined fol' the character of the work being done depending upon the resistance 't'ocjthe' e'ntry of the pin into the drill steel; The tank V is vented'to atmos phere through the pipe connectiond 'andi'at- 'mos heric'portU, a 7 To return the-"piston" and of the drill steel the valve S isreve'rsed in order toconne'ct-the supply pipe R to the connection d and'open the rearward-endof the cylinder to'ja'tm'osphere through the port U. Pressure fluidadmittedtothe reservoir tank V above the oil 9 will force the oil un- 'der pressure b'ackinto the for'ward'end of the cylinder and carry the piston rearwardly at a given velocity depending upon thes'etting of theinterme'diate valve Thefreciproc'ation-of the piston is controlled by the valve S and thep in, may be quickly thrust into. the drill steel'and withdrawn befor'e the 1 pin has hadtime to become heated'and softened and'b'efo'r'e the "drill steel has cooled sufficiently togrip thep'in' andprevent its 40 witl'id rawal. V V 7 lVitho'utthe fluid. cushion described, the piston 13 is driven forwardlso rapidly during the'first part of'the' stroke to carry'the pin into the: open end of, the steel thatthe pressure fluid-behind thepisto'n'expandsand the'in'aximum effort is lost :as'the resistance to the entry of the pin into the "steel increases. With i'mp'rovement'the maxiof the cylinderfanda'pi-p'e connectionol isprovided between saidtank'V and the valve casing Q. 7

With the positionof theparts as indicated in Figure 2, motive fluid'from the supply" pull thepin out mum air' pressure isobtained into thesteel pipe R passes through the connection cl to thereservoir'tank V and oil under pressure passes into the cylinder 1) behindthe piston E to force the piston forwardly while the oil in front of the piston passes --i nto--the reservoir: V whichis open to atmosphere-through the atmospheric port U. By reversing the valve S-the opposite condition obtains and the oil under pressure from the tank V forces the-- piston"rearwardly while the oil behind the piston passes into the tank V. The velocity of the piston is "controlled in both* directions and the piston-maybe movedfoi ,jwardly and fbackwardly" at will by "manipulating "the valve S;

"tion' of 'means for-'clamping-a drill steel to'be punched, a cylinder, a'fluid' actuate-d recip- 'rocatorylpi-ston int-he cylinder, apin punch carried by'the-pistonand adapted to enter the'drilIsteel, a reservoir tank for"cushioni'n'g fluid, a connectionl-eading from the'upper endof the'tank'tothe front endof the-cylinder, a-tube in -thetanl'r corn'municatingwith "the connection for conveying cushioning fluid from the bottom of the tank" to the forward end of the cylinder, and meansforsu'p- Tplyingmotive fluid to the 'cylindn'for 'driv ing the piston forwardlyand for forcing the cushioningfiuid from thetank' intothe front 'end of the* 'cylindendur'irrg the rearward stroke of'the N piston. I 2. *In a shank and ibit'punch, the combination" of" means 5 for clamping -a drill steel to be punched, a cylinder, afluid; actuated re clpro'catory piston in the'cylln'der, a pin punch carried by the pistonand adapted to "enter the drill steel, a reservoir tank for cushioning fluid, aconnection leading from the upper end o'fthe' tank to the front end of the-cylinder, a tube in' the tank communicatlng ywith the connection for" conveying cushioning flu'id 1 from the bottom of the tank to the forward endof the cylinder;-.a valveforsupplying inotivefluid t'othe rearward end of the cylinderin one position of 'the valve for driving the piston forwardly, and"in' another position of the valve for supplying motive fluid to the tank for forcing the cushioning fluid from" the 't'a-fnk to the front end of the cylinder in readiness to cushion the next forward stroke of thefpiston', and 1 means-in the tank for retarding the {flow"of cushioning-'fluid-from the cylinder into the tank.

3; In a shank-. and bit punch, the combination of means for clampinga dri-ll steel 'to he punched, a cylinder, a fluid 5 actuated reciproapin' punch cat'ory piston in the: cylinder,- carr1ed b'y the piston and adapted toenter the drill 3 steel, a reservoir tank for cushioning fluid, a connection leading from the'upper'end of the tank to thefro'nt endof the cylinder, a tube in'the tank communicating with the connection for conveying cushioning fluid from the bottom of the tank to the forward end of thecylinder, a valve for supplying motive fluid to the rearward end of the cylinder in one position ofthe valve for driving the piston forwardly, and in another position of the valve for supplying motive fluid to the tank for forcing the cushioning fluid from the tank to the front end of the cylinderin readiness to cushion the 1 In testimony whereof I have signed this 15 specification.

LEWIS, o. BAYLES, 

